CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

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Chapter 7 C H A P T E R 7 The chapter provides important conclusions from the results of the investigations carried out on morphological and compositional analysis of passive film of 304L SS in nitric acid, as well as by sub-surface, and top-surface modifications on the corrosion behaviour of 304L SS in nitric acid medium. Apart from this, the chapter provides a summary and suggests additional work which may be carried out in future to further understand the corrosion behaviour 304L SS in nitric acid medium. 7.1 Conclusions from the study on morphological and compositional analysis of passive film on AISI 304L stainless steel in nitric acid medium Following are the major conclusions from the study on “morphological and compositional analysis of passive film on AISI 304L stainless steel in nitric acid medium” to understand the passive film properties of 304L SS in nitric acid. 1. Ex-situ passive film surface morphology study after immersion in 1 M, 4 M, 8 M and 11.5 M nitric acid up to 27h showed good passive film stability in 1 M and 4 M nitric acid, respectively. In 1 M and 4 M nitric acid, homogenization of the passive film and decrease in root mean square roughness value from 15 nm to 10 nm was observed with increase in immersion time up to 27 h. In 8 M nitric acid, homogenization of the passive film as well as breakdown of passive film as distorted topography on the polished surface was observed with increase in immersion time. The root mean square roughness increased from 15 nm to 28 nm after immersion for 27 h. In 11. 5 M nitric acid formation of uniform passive film was not
Chapter 7 observed with increase in immersion time, instead surface became stained with degraded passive film and corrosion products with increase in root mean square roughness from 15 nm in as polished condition to 52 nm after immersion for 27 h. 2. Potentiodynamic polarization study in 0.1 M, 0.5 M, 0.6 M, and 1 M nitric acid showed increase in passive current density and corrosion current density, and decrease in transpasive potential with increase in concentration of nitric acid. Passive current density increased by one order, corrosion current density increased by two order, and transpassive potential decreased by 150 mV vs. Ag/AgCl from 0.1 M to 1 M nitric acid. 3. In-situ passive film surface morphology study in 0.1 M, 0.5 M, 0.6 M, and 1 M nitric acid using EC-AFM showed the growth of passive film in the form of platelet like structure at lower concentration of 0.1 M and 0.5 M nitric acid. At concentration of 0.6 M and 1 M nitric acid the platelet like structures got agglomerated, homogenized and started depleting from the surface leading to selective dissolution and opening up of oxide boundaries. 4. X-ray photoelectron spectroscopy analysis of passive film as observed in in-situ study in 0.1 M, 0.5 M, 0.6 M, and 1 M nitric acid revealed the presence of hydroxide and oxide layer on 304L SS at lower concentration of 0.1 M and 0. 5 M nitric acid. Towards higher concentrations of 0.6 M and 1 M nitric acid, presence of oxide layer was observed. Overall, the passive film at lower concentration consists of hydroxide and oxide layer, and at higher concentration it consists of oxide layer only. 7.2 Conclusions from the study on corrosion behaviour of nitrogen ion implanted AISI 304L stainless steel in nitric acid medium Followings are the major conclusions from the study on “corrosion behaviour of nitrogen ion implanted AISI 304L stainless steel in nitric acid medium” to understand the effect of subsurface modification on the corrosion behaviour of 304L SS in nitric acid medium.
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2.3 Effect of alloying elements on
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The ex-situ study of passive film w
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Fig.3.10: Schematic of electrical e
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Fig.6.11: Polarization study of unc
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AISI: American Institute of Steel I
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Chapter 1 C H A P T E R 1 Spent Nuc
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Chapter 1 1.3 Challenges in spent n
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Chapter 1 corrosion resistance. The
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Chapter 1 choice of zirconium is du
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C H A P T E R2
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Chapter 2 temperature, (c) higher i
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Chapter 2 Chromium in excess of 12
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Chapter 2 2. 3 Effect of alloying e
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Chapter 2 The twins are identified
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Chapter 2 and at temperature around
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Chapter 2 of adsorption of oxygen o
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Chapter 2 transpassive dissolution
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Chapter 2 healing chromium oxide fi
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Chapter 2 their segregation to the
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Chapter 2 is intimately related to
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Chapter 2 in nature because the dis
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C H A P T E R3
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Chapter 3 3.1.1.2 Specimen preparat
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Chapter 3 ionized. However, differe
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Chapter 3 various industrial applic
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Chapter 3 In the present investigat
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Chapter 3 3.1.3.2 Atomic force micr
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Chapter 3 present on the surface fo
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Chapter 3 necessary condition is th
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Chapter 3 Y m is the sputter yield.
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Chapter 3 Fig. 3.7: Schematic of X-
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Chapter 3 rate of 10Å/min using 5
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Chapter 3 different doses of nitrog
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Chapter 3 The modulus of electroche
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Chapter 3 equivalent circuit as sho
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Chapter 3 reference electrode with
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Chapter 3 for understanding the pas
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C H A P T E R4
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Chapter 4 encountered by all materi
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Chapter 4 pitting, and intergranula
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Chapter 4 The ridged structure, and
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Chapter 4 nitric acid is that the b
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Chapter 4 Potential (V) Vs Ag/AgCl
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Chapter 4 4.2.3 In-situ electrochem
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Chapter 4 The surface morphologies
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Chapter 4 a b c d Opening up of gra
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Chapter 4 Intensity (Arbitrary unit
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Chapter 4 The chromium, and oxygen
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Chapter 4 Intensity (Arbitrary unit
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C H A P T E R5
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Chapter 5 elements, and often impar
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Chapter 5 5.2 Results and discussi
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Chapter 5 Presence of oxygen is due
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Chapter 5 was an increase in marten
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Chapter 5 formation of Cr 2 N was a
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Page 154 and 155: Chapter 6 The high phase angle over
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Page 172 and 173: Chapter 6 6.2.3.5 Morphological exa
Page 176 and 177: Chapter 7 1. Surface morphology exa
Page 178 and 179: Chapter 7 6 Duplex Ti-TiO 2 coated
Page 180 and 181: Chapter 7 EC-SPM study on effect
Page 183 and 184: [1] Baldev Raj, U. Kamachi Mudali,
Page 185 and 186: [37] G. Okamoto, T. Shibata, Corros
Page 187 and 188: [79] M. Moens, M. Van Craen, F.C. A
Page 189 and 190: [117] R.E.Williford, C.F.Windisch J
Page 191 and 192: [157] N. Mottu, M. Vayer, R. Erre,
Page 193: [197] M. Metikos Hukovic, M. Ceraj
Page 196 and 197: [19] H. H. Uhlig, Corros Sci, 19 (1
Page 198 and 199: [57] J. F. Ziegler, J. P. Biersack,
Page 200 and 201: [97] I. Betova, M. Bojinov, V. Kara
Page 202 and 203: [139] V. Ashworth, R. P. M. Procter
Page 204 and 205: [176] G. Frankel, G. Grundmeier, H.
Page 207 and 208: List of publications 1. Referred
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CHEM02200704003 Nilamadhab Pandhy - Homi Bhabha National ...

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